netdev - Re: [PATCHv4 net-next 09/10] net: add gso_ipv4_max_size and gro_ipv4_max

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Message-ID: <d8ddc04e-205a-e57b-22b9-61973dad67cf@gmail.com>
Date:   Wed, 1 Feb 2023 08:36:08 -0700
From:   David Ahern <dsahern@...il.com>
To:     Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, kuba@...nel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Pravin B Shelar <pshelar@....org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Ilya Maximets <i.maximets@....org>,
        Aaron Conole <aconole@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Mahesh Bandewar <maheshb@...gle.com>,
        Paul Moore <paul@...l-moore.com>,
        Guillaume Nault <gnault@...hat.com>
Subject: Re: [PATCHv4 net-next 09/10] net: add gso_ipv4_max_size and
 gro_ipv4_max_size per device

On 1/28/23 8:58 AM, Xin Long wrote:
> This patch introduces gso_ipv4_max_size and gro_ipv4_max_size
> per device and adds netlink attributes for them, so that IPV4
> BIG TCP can be guarded by a separate tunable in the next patch.
> 
> To not break the old application using "gso/gro_max_size" for
> IPv4 GSO packets, this patch updates "gso/gro_ipv4_max_size"
> in netif_set_gso/gro_max_size() if the new size isn't greater
> than GSO_LEGACY_MAX_SIZE, so that nothing will change even if
> userspace doesn't realize the new netlink attributes.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> ---
>  include/linux/netdevice.h    |  6 ++++++
>  include/uapi/linux/if_link.h |  3 +++
>  net/core/dev.c               |  4 ++++
>  net/core/dev.h               | 18 ++++++++++++++++++
>  net/core/rtnetlink.c         | 33 +++++++++++++++++++++++++++++++++
>  5 files changed, 64 insertions(+)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>